https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf 23.7 2026-04-15T10:53:30.610Z https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/sciencekeywords/bf3aaf41-3502-49cf-89df-4613ce87c9c3 TOXIC CHEMICALS Date=2018-03-07 User Id=tstevens Entity=BroaderRelation Operation=DELETE User Note=Move Concepts System Note=delete broader relation Old Value=TOXIC CHEMICALS [bf3aaf41-3502-49cf-89df-4613ce87c9c3,85115] - WATER QUALITY/WATER CHEMISTRY [8c02f5d1-ce86-4bf5-84d5-b3496cdba6ad,83565] Date=2018-03-07 User Id=tstevens Entity=BroaderRelation Operation=INSERT User Note=Move Concepts System Note=add broader relation New Value=TOXIC CHEMICALS [bf3aaf41-3502-49cf-89df-4613ce87c9c3,85115] - CONTAMINANTS [42c6d91b-afef-4638-95c5-0d130828b2e7,84623] Date=2018-03-07 User Id=tstevens Entity=Definition Operation=UPDATE Field=reference System Note=update Definition Old Value=Environmental Protection Agency New Value=Environmental Protection Agency Date=2018-03-07 User Id=tstevens Entity=Definition Operation=UPDATE Field=text System Note=update Definition Old Value=Toxic Chemicals are identified as chemicals that can cause serious harm to the environment including lakes, oceans, and biota. New Value=Toxic Chemicals are identified as chemicals that can cause serious harm to the environment including lakes, oceans, and biota. Date=2018-03-07 User Id=tstevens Entity=Definition Operation=UPDATE Field=text System Note=update Definition Old Value=Toxic Chemicals are identified as chemicals that can cause serious harm to the environment including lakes, oceans, and biota. New Value=Chemicals that can cause serious harm to the environment including lakes, oceans, and biota. Chemicals that can cause serious harm to the environment including lakes, oceans, and biota. 2018-03-07 09:59:18.0